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Use of Special Purpose Entities and Variable Interest Entities (Loan Securitization Transaction) (Details) - Asset-backed Securities, Securitized Loans and Receivables - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |  |
Aggregate fair value | $ 1,290,029 | $ 1,290,029 |  | $ 1,290,029
Principal amount of Securitized debt | 27,000 | 27,000 |  |
Outstanding amount of Senior Bonds, at carrying value | 495,582 | 495,582 |  | 570,952
Outstanding amount of Senior Bonds, at fair value | 20,520 | 20,520 |  | 0
Outstanding amount of Senior Bonds | $ 516,100 | $ 516,100 |  | $ 571,000
Weighted average interest rate | 3.79% | 3.79% |  | 3.68%
Weighted average contractual maturity of Senior Bonds |  | 29 years | 30 years |
Cash received | $ 18,400 | $ 821,175 | $ 802,815 |
Debt issuance cost | 2,500 | 2,500 |  | $ 2,900
Senior notes |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount of Securitized debt | 829,817 | 829,817 |  | 802,817
Proceeds from Senior bond sold with Step up feature |  | $ 451,700 | $ 493,200 |
Debt instrument, basis spread on variable rate |  | 3.00% |  |
Debt instrument, coupon step-up period |  |  | 36 months |
Senior Support Certificates |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Principal amount of Securitized debt | $ 248,174 | $ 248,174 |  | $ 275,174

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